NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T04:38:13 PDT
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For refcode 2009ApJ...705..356B:
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...705..356B The Role of the Synchrotron Component in the Mid-Infrared Spectrum of M 87 Buson, L.; Bressan, A.; Panuzzo, P.; Rampazzo, R.; Valdes, J. R.; Clemens, M.; Marino, A.; Chavez, M.; Granato, G. L.; Silva, L. Abstract. We study in detail the mid-infrared (MIR) Spitzer-IRS spectrum of M 87 in the range 5-20 micron. Thanks to the high sensitivity of our Spitzer-IRS spectra we can disentangle the stellar and nuclear components of this active galaxy. To this end, we have properly subtracted from the M 87 spectrum the contribution of the underlying stellar continuum derived from passive Virgo galaxies in our sample. The residual is a clear power law, without any additional thermal component, with a zero-point consistent with that obtained by high spatial resolution, ground-based observations. The residual is independent of the adopted passive template. This indicates that the 10 micron silicate emission shown in the spectra of M 87 can be entirely accounted for by the underlying old stellar population, leaving little room for a possible torus contribution. The MIR power law has a slope {alpha}~0.77-0.82 (S_{nu}_ vprop {nu}^-{alpha}^), consistent with optically thin synchrotron emission. Key words: galaxies: active, galaxies: elliptical and lenticular, cD, galaxies: individual: M 87, galaxies: jets, infrared: galaxies
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